Vectorial Field-Oriented Servomechanism For Asynchronous Three-Phase Motor Model PCT 111

In AC servomechanisms of the last years, the vectorial F.O.C. field- oriented control technology is dominating. Used with three-phase asynchronous motors, they allow to reach torque and speed performances, superior to those obtained with traditional scalar technology.
Sci-tech Vectorial field-oriented control servomechanism for asynchronous three-phase motor Model PCT 111 enables the student to learn, demonstrate and experiment the main concepts of field oriented control, enriching the personal theoretical background with the practical aspects of industrial design and maintenance. The power of the servomechanism, the circuit solutions, the used components, make the training program to be developed on a totally industrial product and not on a simulator.

Item Description

MOTOR Model PCT 111 Mainly consists of:
* An industrial vectorial inverter for asynchronous three- phase bidirectional motor;
* An external unit consisting of a three-phase asynchronous motor.
The available control modes are:
• Field orientation with speed sensor;
• Field orientation without speed sensor (Sensorless);
• V/Hz control.
The servomechanism is mounted on the aluminum structure, an innovative system for teaching presentation combining the demonstration effect with the operative functionality.
The compact unit includes:
* An electronic circuit of the equipment;

* A silk-screen printed diagram with detailed block diagram;
* A panel with controls, signaling, test points;
* A non-destructive fault simulator.
The servomechanism is connected to the external motor via an 8-pole cable. A dedicated electronic board, provided with the equipment Model PCT 111, enables the PC interfacing for data acquisition and process supervision experiences. The parametrization of the servomechanism is made with a keyboard with LCD display or via PC with dedicated software supplied with the system.
A faults’ simulation system enables the insertion of 8 different non-destructive faults through switches; the faults simulated are typical cases verified in the industrial use of the system

Technical Specifications

* Aluminum mounting structure;

• Silk screen printed diagram with the different circuit blocks of the system;

• Measurement test-points;

• External control panel with switches and rotary potentiometer;

• Non-destructive fault simulator: possibility of insertion of 8 faults @max with same number of switches.

* Power Supply: 230v 1Ph, 50Hz; 1.5KVA

• Speed set-point which can be fixed via potentiometer or PC;
• Speed regulation range: ± 3000 rpm; • Auxiliary voltages obtained with DC/DC converter inside the drive
• 6 IGBT transistor three-phase inverter; • SVM (Space Vector Modulation) to keep the noise level to the minimum
• Possibility of controls: sensorless, with encoder and V/Hz; • Inverter programming via keyboard with back-lighted LCD display or PC with dedicated software and serial interface;
• Controls: speed and torque; • Autotuning procedure for current, flow and range regulators; • 8 inner speed references and 4 inner linear or “S” ramps;

• Digital inputs for encoder analog differentials; • Outputs protected against the accidental grounding and phase short-circuit across the output and overload control; • Alarm signaling on the keyboard display


• Metal base;

• Nominal phase voltages: 3 x 230 V;

• Three-phase asynchronous motor with squirrel cage rotor;

• Nominal speed: ± 3000 rpm